Go for a walk. Walking around a cute neighborhood or on some favorite nature trails is a fine way to shape up. If you're ambitious, go for a run-but take care of your knees!
Go for a ride. Riding a bike around the same places that you like to walk is good too. I actually won a new bike not so long ago, but haven't used it much. I plan to change that this summer.
Take advantage of natural exercise. My food mill takes more muscle than a food processor. Same goes for mixing by hand instead of pulling out my electric mixer. Heck, even basic cleaning jobs will burn some calories for you. Soon, I will be working on my gardening and landscaping-plenty of exercise there! As I learn to do more for myself, I discover more and more ways to get in a little exercise every day.
The possibilities are really endless. Join a community sports group. Play on the playground with the kids. Run around with your dog at a dog park. Be creative and you'll find that you're getting in better shape without even realizing it!